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9 pin D-SUB male схематический вид разъема
9 pin D-SUB male разъем
at the PC
9 pin D-SUB male схематический вид разъема
9 pin D-SUB male разъем
at the UPS
APC part # 940-0119A.

Compaible with:

The BackUPS ES has a straight through serial cable with no identification on the plugs.

     computer           ----------- BackUPS-ES -----------------
     DB9-M              DB-9F
     pin    signal      pin
     
      4      DSR   ->    4 --+
                             |  diode   resistor
      6      DTR   ->    6 --+---->|----///---o kill power
     
      1      DCD   <-    1 --+
                             |
      2      RxD   <-    2 --+----------------+--o low battery
                                              |
      7      RTS   ->    7 --------+--///--+
                                   |
                                   +--///--+
                                              |
      8      RI    <-    8 --+----------------+--o on battery
                             |
      9      CTS   <-    9 --+
     
      5      GND   ---   5 ----------------------o ground
     
      3      TxD         3 nc
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